- tons per square inch.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for tsi
So the well-educated TSI visitors follow a rule: “Within these walls, we never talk politics.”Where Chechens Go to Escape Their Surreal Past—and Risky Present
December 9, 2014
If the syllables preceding the suffix -tsi also contain -tsi-ti.
Other proper names, especially those of mountains and the villages built on them, take the suffix -tu (upon) instead of -tsi.